Electronic Devices-Power Amplifiers
Electronic Devices-Power Amplifiers
1. Class B operation is provided when the dc bias leaves the transistor biased just off, the transistor turning on when the ac signal is applied.
- TRUE
- FALSE
2. The main features of a large-signal amplifier is the circuit's ________.
- power efficiency
- maximum power limitations
- impedance matching to the output device
- All of the above
3. The principal advantage(s) of BJTs over MOSFETs is (are) that
- voltage drop across the transistor is important.
- they are not as prone to ESD.
- both of the above
- none of the above
4. What is the ratio of the secondary voltage to the primary voltage with the turn ratio in the windings?
- N2/N1
- (N1/N2)2
- (N1/N2)1/3
- N1 × N2
5. Class ________ amplifiers are normally operated in a push-pull configuration in order to produce an output that is a replica of the input.
- A
- B
- C
- AB
6. Which type of power amplifier is biased for operation at less than 180º of the cycle?
- Class A
- Class B or AB
- Class C
- Class D
7. Class AB operation is ________ operation.
- similar to class A
- similar to class B
- similar to class C
- None of the above
8. The principal advantage(s) of MOSFETs over BJTs is (are)
- their biasing networks are simpler.
- their drive requirements are simpler.
- they can be connected in parallel for added drive capability.
- all of the above
9. Which of the following instruments allows more precise measurement of the harmonic components of a distorted signal?
- Digital multimeter
- Spectrum analyzer
- Oscilloscope
- Wave analyzer
10. In class B operation, at what fraction of VCC should the level of VL(p) be to achieve the maximum power dissipated by the output transistor?
- 0.5
- 0.636
- 0.707
- 1